Power Supply Synchronous Rectification Medical Standards
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Solution Overview
Problem
Existing power supplies with synchronous rectification-type rectifying and smoothing circuits face challenges in increasing conversion efficiency while avoiding increased product costs, particularly due to the need for costly field-effect transistors with high gate voltage durability, and lack the ability to dynamically change output current.
Innovation Solution
A power supply configuration with multiple secondary windings and synchronous rectifiers, each with a smoothing capacitor and driven by a switch driver, allows for parallel or series connection of outputs to adjust voltage and current, using low-cost transistors and incorporating a transformer with reinforced insulation for medical standards compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a synchronous rectification-type rectifying and smoothing circuit is used to increase conversion efficiency, then conversion efficiency is improved, but costly field-effect transistors with high gate voltage durability are required, increasing product cost
Solution Approach 1:
The power supply is divided into multiple independent modules, each with its own synchronous rectification circuit. This segmentation allows each module to operate independently with standardized, low-cost transistors, while the overall system achieves high conversion efficiency through the combined operation of multiple modules.
Solution Approach 2:
Instead of using a single high-voltage transistor, the patent transitions to a multi-dimensional approach by creating multiple parallel modules. Each module handles a portion of the total power, allowing the use of low-voltage transistors in each dimension while achieving the same overall power handling capability.
2Adaptability or versatility
If multiple secondary windings and synchronous rectifiers are used to enable voltage and current adjustment, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic adaptability through switchable module configurations. Modules can be connected in series to increase output voltage or in parallel to increase output current, allowing the system to dynamically adapt to different power requirements without redesigning the entire circuit architecture.
Solution Approach 2:
Each module is designed as a universal building block that can function in multiple configurations. The same module design serves both as a voltage source and a current source depending on how it is connected to other modules, simplifying the overall system design while maintaining high versatility.
3Reliability
If a transformer with reinforced insulation is used to meet medical standards, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The transformer is divided into multiple secondary windings, each serving a specific module. This segmentation allows the reinforced insulation to be implemented in a standardized manner across multiple isolated windings, making it easier to manufacture while ensuring medical standards compliance through inherent isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances conversion efficiency of output voltage and current, allows for cost-effective production by using low-cost transistors, and meets medical standards without external isolation transformers or fuses, enabling flexible voltage and current adjustments.
Implementation Method 1
a transformer (3) including a primary winding (11) and a plurality of secondary windings (121, 122, and 123)
Implementation Method 2
a plurality of synchronous rectifiers (51, 52, and 53) which respectively perform synchronous rectification of alternating current (AC) voltages generated in the corresponding secondary windings
Implementation Method 3
a plurality of smoothing circuits (61, 62, and 63) which respectively smooth voltages outputted by the corresponding synchronous rectifiers
Data Source
AI summary
A power supply includes a synchronous rectification-type rectifying/smoothing circuit to increase the conversion efficiency of an output voltage, avoids cost increases, and can change the output voltage and maximum output current. The power supply includes synchronous rectifiers connected to secondary windings of a transformer, smoothing circuits that smooth a voltage outputted from the synchronous rectifiers to produce an output voltage, switch drivers that correspond to the synchronous rectifiers and operate on one or both of the output voltage outputted from the smoothing circuits connected to the synchronous rectifiers and an AC voltage generated in the secondary windings to drive synchronous rectification switches of the synchronous rectifiers, and an output connector that is disposed following the smoothing circuits and connects the outputs of the smoothing circuits in a connection pattern selected out of serial and parallel.